Hi @IvankoPo
I will say that we are very proud of how Weaviate scales - for example, we can comfortably scale to hundreds of millions of vectors (The Sphere Dataset in Weaviate | Weaviate - vector database) in our index.
While we can’t predict specific times taken for operations as that will be very system-dependent, we do have example benchmarks like these: ANN | Weaviate - vector database
I hope that helps!
Edit: Oh, as far as resource planning goes - we have this page as guidelines 
Resource Planning | Weaviate - vector database